Handle mount portion of drywall duster base



FIG. 1 is a perspective view of a handle mount portion showing my new design; and,

FIG. 2 is a side elevation view of one side thereof.

The broken line showing of the drywall duster base of which the handle mount portion is a part is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a handle mount portion of drywall duster base, as shown and described. 